After running the example code, I was able to run those same functions on my own datasets; however, I couldn't run some of the other functions that are written into the mfexport.py script. For example, I tried running mfexport.get_package_list(), and received the error message that this attribute did not exist within mfexport. It would be helpful if it were made clear somewhere which functions are currently available to the user.
Similarly, it is unclear which MODFLOW packages are supported by the mfexport.export() function. As in the example, it is clear that WEL is supported, but when I tried SFR, for example, I got an error message that this was not yet implemented in the code.